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led driving circuit and its switching power supply controller

A technology of LED driving and switching power supply, which is applied in the direction of electric light source, electric lamp circuit layout, light source, etc., and can solve the problems of cost increase and circuit area increase

Active Publication Date: 2017-08-25
HANGZHOU SILAN MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there is a disadvantage that the second power switch M2 must be used, resulting in an increase in circuit area and cost

Method used

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  • led driving circuit and its switching power supply controller
  • led driving circuit and its switching power supply controller
  • led driving circuit and its switching power supply controller

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0219] refer to image 3 , The LED driving circuit of the first embodiment includes: a freewheeling diode D1 , an output capacitor C1 , an inductor L1 , a sampling resistor Rcs, a power supply capacitor C2 and a switching power supply controller 300 . The switching power supply controller 300 includes a power driving tube M1 , a grid zero-crossing detection circuit 301 , a comparator circuit 303 , a driving circuit 310 and a high-voltage starting power supply circuit 305 .

[0220] Wherein, the cathode of the freewheeling diode D1 is connected to the input voltage input terminal Vin to receive the input voltage; the first end of the output capacitor D1 is connected to the cathode of the freewheeling diode D1; the first end of the inductor L1 is connected to the anode of the freewheeling diode D1, The second end of the inductor L1 is connected to the second end of the output capacitor C1.

[0221] The drain of the power driving transistor M1 is connected to the first end of th...

no. 2 example

[0250] refer to Figure 8 , The LED driving circuit of the second embodiment is a floating structure, including: a freewheeling diode D1, an output capacitor C1, an inductor L1, a sampling resistor Rcs, a power supply capacitor C2 and a switching power supply controller 300 . The switching power supply controller 300 includes a power drive tube M1 , a gate zero-crossing detection circuit 301 , a comparator circuit 303 , a logic sum drive circuit 302 , an RS flip-flop 304 and a high-voltage start-up power supply circuit 305 .

[0251] In the second embodiment, the internal structure of the switching power supply controller 300 is the same as that of the first embodiment, the only difference is that the ground of the switching power supply controller 300 is a floating ground, which is different from the ground of the input voltage.

[0252] The connection mode of peripheral circuits other than the switching power supply controller 300 in the second embodiment is different from t...

no. 3 example

[0256] refer to Figure 9 , The LED driving circuit of the third embodiment is another floating structure, including: a freewheeling diode D1, an output capacitor C1, an inductor L1, a sampling resistor Rcs, a power supply capacitor C2 and a switching power supply controller 500 . The switching power supply controller 500 includes a power drive tube M1 , a gate zero-crossing detection circuit 501 , a comparator circuit 503 , a logic sum drive circuit 502 , an RS flip-flop 504 and a high-voltage start-up power supply circuit 505 .

[0257] In the third embodiment, the internal structure of the switching power supply controller 500 is the same as that of the first embodiment, the main difference is that the ground of the switching power supply controller 500 is a floating ground, which is different from the ground of the input voltage. Specifically, the high-voltage start-up power supply circuit 505 is connected to the floating ground through the power supply capacitor C2, and t...

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Abstract

The invention provides an LED drive circuit and a switching power controller thereof. The switching power controller comprises a power driving tube, a grid zero cross detection circuit and a driving circuit, wherein the grid zero cross detection circuit is used for achieving inductive current zero cross detecting by detecting the grid flowing-into current of the power driving tube, responding to inductive current zero cross and outputting zero cross detecting signals, the driving circuit is used for producing driving signals according to the zero cross detecting signals and responding to the zero cross detecting signals, and the driving signals are used for controlling conducting of the power driving tube. According to the LED drive circuit and the switching power controller thereof, zero cross detecting of the inductive current is achieved by detecting the current flowing into the grid electrode of the power driving tube when the inductance is zero, the driving signals can directly drive the power driving tube, a circuit is simple, achieving is convenient, and the circuit cost is greatly saved.

Description

technical field [0001] The invention relates to switching power supply technology, in particular to an LED drive circuit and a switching power supply controller. Background technique [0002] Such as figure 1 As shown, the traditional step-down structure LED drive circuit adopting the source drive mode includes a resistor R1, a capacitor C2, a freewheeling diode D1, an output capacitor C1, an inductor L1, a first power switch M1, a sampling resistor Rcs, and a switching power supply controller 100. The switching power supply controller includes a second power switch M2 , a zero-crossing detection circuit 101 , a logic and driving circuit 102 , a comparator 103 and an RS flip-flop 104 . The first power switch M1 is a high-voltage power switch, the second power switch M2 is a drive control switch, the zero-crossing detection circuit 101 detects the voltage signal at the drain end of the second power switch M2, and the drive signal GT controls the second power switch M2 to re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/08H05B37/02
CPCH02M1/08H05B45/37
Inventor 朱晓杰
Owner HANGZHOU SILAN MICROELECTRONICS